It seems that that the controversy regarding how much suffering an execution causes could be ended by just using general anesthesia ahead of the execution. Is it legal for a US state to use general anesthesia before executing a prisoner? If the answer depends on state, use Alabama and suffocation by nitrogen gas as execution method.
To clarify, I am not asking if it is currently legal by the state law, but if something is preventing that state to make anesthesia a legal part of an execution.